Friction surface



Dec. 23, 1930. H. F. BuscH FRICTION SURFACE Filed April 28 INVENTOR 7 M Patented Dec. 23, 1930 UNITED, STATES PATENT OFFICE HERMAN F. BUSCH, OF MILLVALE, PENNSYLVANIA, ASSIGNOR T ARMSTRONG CORK COMPANY, PITTSBURGH, PENNSYLVANIA, A. CORPORATION OF PENNSYLVANIA :rqaicrlon SURFACE I Application filed April 28, 1926, Serial No. 105,200.

.This invention relates to a friction surface and is particularly adaptable to the covering .for the take-up roll of a loom.

The take-up roll of a loom takes the cloth after it is woven and draws it through the loom to keep the proper tension on the warp threads. Heretofore, sand paper covered rolls have been commonly used for this purpose, or rolls which have been made of sheet metal punctured to have outstanding protrusionssomewhat similar to an ordinary nutmeg grater. These rolls have been objectionable in that they have a tendency to roughen fine goods and pull up the threads. Further difficulties are encountered in the use of these metal rolls, roughened as indicated, in that provision, must be made to change the roll for different qualities and Weights of cloths, because one sheet metal go roll may be too rough for a finer quality of cloth, although it may beusable on heavier goods.

I provlde a frictional surface, applicable to such rolls, which will give the proper grip 011 the cloth, and which will be applicable to the finer goods without danger of roughening the goods or pulling up the threads. I obtain improved frictional qualities combined with smoothness of operation by the use of a cork surface which has been indented to form an irregular or bumpy surface.

In the accompanying drawings illustrating the present preferred embodiment of the invention,---

V Figure 1 is a side elevation of a loom takeup roll embodying my invention;

Figure 2 is a top plan view of the cork friction strip employed;

Figure 3 is a sideelevation of the strip 49;.- shown in Figure 2;

Figure 4 is a sectlonalview on the line IV.- V of Figure 2;.and

Figure 5 is a cross section on the line V-V of F1 ure 2. y ti}; Re erring to the illustrated embodiment, Figure 1 shows a roll 2 having a friction surface strip'3 made according to my invention wound helically thereon, the strip 3 being cemented to the rdll 2 by any suit- 50 able adhesive. The strip 3 is preferably made comparatively narrow, so that its inner surface 4 may be made to conform quite closely to the surface of the roll 2. In practice a width of about two inches has been found to be satisfactory, but this width may be varied as desired depending upon the diameter of the. roll 2, ease of application and convenience of manufacture of the strip;

As shown in Fig. 2, the frictional surface is preferably formed by a'strip of cork having a regular, undulatory surface from which ridges have been cut at spaced intervals. The strip of cork is of indeterminate length, and is cut from a block of compressed artificial cork so that the planes of compression of the cork granules are at an angle, pre ferably normal, to the surface. I

The artificial cork is composed of granulated cork pressed and held inla solid resilient mass by means of an elastic binder. Any of the usual formulae for making artificial cork may be followed but preferably'tliat of the Busch Patent 1,532,682 of April 7, 1925. The strip is cut from a block of artificial cork so that the flattened granules are normal to the fiat surface of the cut strip as described in said Busch Patent 1,532,682. While the cork strip may be otherwise cut, it is of advantage to have the pressed flattened cork granules disposed edgewise to the working surface, as this arrangement of the granules gives better wear resisting qualities to the surface as more fully described in said Busch patent. The strip 3 thus formed is then cut to form a plurality of parallel ridges 5 extending longitudinally, on the strip and being spaced substantially equidistant across the strip. The ridges are then cut away at spaced intervals to form notches 6, thereby forming substantially regularly spaced projections 7. It will be understood that the regularity of spacing of the projections 7 presents a method of making the "surface whereby a large number of projections are obtained on a relatively small area by a sun-.

plified process of manufacture.

The number of projections the surface is of more importance than the particular geometrical arrangementemployed.

shown in Figures 3 and 5, valleys 8 between the ridges 5 and the notches 6 between the projections 7 are cut to such depth that the remaining solid portion 9 has a thickness substantially equal to the height of the projections 7. It is obvious that any other thickness may be employed for the solid portion 9 which will leave the strip strong and at the same time be economical with material; in practice the above proportion has been 'found to give good results.

ally, the surface is supplied, preferably, in.

convenient strips which may be readily applied to various frictional devices.

While I have illustrated and described the present preferred embodiment of my invention, it will be understood that the invention is not limited to the details above set forth, but that theinvention may be otherwise embodied within the scope of the following claims.

I claim:

1. A compressed artificial cork bod having a plurality of integral projections t ereon forming an irregular frictional surface, the planes of compression of the cork granules being at an angle to the Working surface at the top of the projections.

2. A frictional roll for cloth having :a compressed artificial cork frictional surface thereon, from which projects a plurality of integral spaced cloth engaging portions, the granules of the artificial cork belng flattened and being so disposed that the planes of the granules extend at a substantial angle to the cloth engaging surface of the projecting portions.

3. A take-up roll for a loom having a compressed artificial cork frictional surface provided with a plurality of integral cloth. en-

gaging projections, the granules of the artificial cork being flattened and being so disposed that the planes of the granules extend at an angle substantially normal to the working surface of the roll.

4. A frictional roll for-cloth comprising a body haying a strip of cork Wound therearound to form a cloth engaging surface, the strip having projections thereon arranged in 'rows lying substantially parallel with the length of the strip, the strip being helically wound on the body whereby the projections my hand.

HERMAN F. BUSCH. 

